一种冷作模具钢共晶碳化物细化热处理工艺，属于冷作模具钢热处理技术领域。将钢锭或钢坯以50℃/h～100℃/h的升温速率加热至1160～1180℃；根据钢锭或钢坯的截面尺寸，以0.08h/(r，H/2)计算确定保温时间：其中，r为钢锭半径，H为钢坯厚度；达到保温时间后，随炉冷却至500℃～室温出炉，或红送直接锻造或轧制处理；冷作模具钢的碳化物由大颗粒分解碎化成小颗粒，同时热塑性提高40％以上。优点在于，提高冷作模具钢的抗开裂、崩韧、折断性能，进而改善提高冷作模具的服役性能和使用寿命。同时改善热塑性提高成材率，可降低制造火次，降低生产成本，提高成材率。

The invention relates to a heat treatment process for refining eutectic carbide of cold work die steel, which belongs to the technical field of heat treatment of cold work die steel. Heat the ingot or billet to 1160~1180 ℃ at a heating rate of 50 ℃/h~100 ℃/h; According to the section size of the ingot or billet, calculate and determine the holding time with 0.08h/(r, H/2): where r is the ingot radius and H is the billet thickness; After the holding time is reached, the furnace shall be cooled to 500 ℃~room temperature, or sent to direct forging or rolling treatment; Carbides in cold-worked die steel are decomposed from large particles into small particles, and the thermal plasticity is increased by more than 40%. The advantages are that the cracking resistance, collapse toughness and fracture resistance of cold work die steel are improved, and the service performance and service life of cold work die steel are improved. At the same time, improving the thermoplasticity and increasing the yield can reduce the manufacturing fire, reduce the production cost and increase the yield.